It's difficult to get excited about something, when we don't actually know anything. All we know is that these characters will be in the film, but we don't know to what extent.
From a basic narrative standpoint, I'd say that these characters are there to establish this as a shared universe (with other, non-Superman related, superheroes existing) from the start.
For all we know, the extent of their involvement is them just being shown in a couple of TV news reports played over the course of the movie.